[填空题]
A bungee jumper with itkyeor0 g / 6yt(gv4/mass 65.0 kg jumwmx*9fdf8v v7i58a e;8vt mbfps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 38.0 s. He finally comes to rest 25.0 m below the level of the bridge. Calculate the spring stifff9w atib v*;xef88 8f5d mvm7vness constant and the unstretched length of the bungee cord.
spring stiffness constant$\approx$ N/m(Round to the nearest integer)
unstretched length of the bungee cord m